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首页> 外文期刊>Industrial Electronics, IEEE Transactions on >An Improved Fault-Tolerant Control Scheme for Cascaded H-Bridge STATCOM With Higher Attainable Balanced Line-to-Line Voltages
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An Improved Fault-Tolerant Control Scheme for Cascaded H-Bridge STATCOM With Higher Attainable Balanced Line-to-Line Voltages

机译：具有较高可达到的平衡线到线电压的级联H桥STATCOM的改进容错控制方案

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摘要

Fault-tolerant operation ability is of great importance for stable operation of cascaded H-bridge (CHB) converters, under open-circuit (OC) or short-circuit (SC) switch failures in submodule (SM). In this article, an improved fault-tolerant control strategy is proposed for CHB-based static synchronous compensator (STATCOM) under SM faults. First of all, compared with the conventional fault-tolerant method of directly bypassing the faulty SMs, the proposed fault-tolerant method takes advantage of the healthy switches of the faulty SMs, where they are still able to generate either positive or negative voltage level. As a result, more output voltage levels can be generated, and it raises the attainable balanced line-to-line voltage, especially when different fault types exist at the same time. Then, based on the specific condition of OC fault or SC fault, when the output voltage reference of the faulty phase reaches its limit, the references of the other two healthy phases are redistributed to generate the desired line-to-line voltage. With the reconfiguration of modulation waves, the attainable balanced line-to-line voltage can be further improved. In addition, the proposed fault-tolerant method possesses the ability of cluster voltage balancing, which is an important issue for the STATCOM application. Simulation and experimental results validate the effectiveness of the proposed fault-tolerant method.
机译：容错操作能力对于级联H-Bridge（CHB）转换器的稳定运行非常重要，在子模块（SM）中的开路（OC）或短路（SC）或短路（SC）开关故障下。在本文中，在SM故障下提出了一种改进的容错控制策略，用于基于CHB的静态同步补偿器（Statcom）。首先，与直接绕过故障SMS的传统容错方法相比，所提出的容错方法利用了故障​​SMS的健康开关，在那里它们仍然能够产生正电压或负电压电平。结果，可以产生更多的输出电压电平，并且它提高了可达到的平衡线到线电压，尤其是当同时存在不同的故障类型时。然后，基于OC故障或SC故障的特定条件，当故障相的输出电压参考达到其极限时，重新分配另一个两个健康阶段的引用以产生所需的线到线电压。随着调制波的重新配置，可以进一步提高可获得的平衡线到线电压。此外，所提出的容错方法具有集群电压平衡的能力，这是Statcom应用程序的重要问题。仿真和实验结果验证了所提出的容错方法的有效性。

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